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/tags/release-0.1-rc2/hive/external/ql/src/java/org/apache/hadoop/hive/ql/udf/UDFFloor.java

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Java | 51 lines | 24 code | 6 blank | 21 comment | 3 complexity | 5b43b1297538a9349bb2060eede1078d MD5 | raw file
 1/**
 2 * Licensed to the Apache Software Foundation (ASF) under one
 3 * or more contributor license agreements.  See the NOTICE file
 4 * distributed with this work for additional information
 5 * regarding copyright ownership.  The ASF licenses this file
 6 * to you under the Apache License, Version 2.0 (the
 7 * "License"); you may not use this file except in compliance
 8 * with the License.  You may obtain a copy of the License at
 9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19package org.apache.hadoop.hive.ql.udf;
20
21import org.apache.hadoop.hive.ql.exec.Description;
22import org.apache.hadoop.hive.ql.exec.UDF;
23import org.apache.hadoop.hive.serde2.io.DoubleWritable;
24import org.apache.hadoop.io.LongWritable;
25
26/**
27 * UDFFloor.
28 *
29 */
30@Description(name = "floor",
31    value = "_FUNC_(x) - Find the largest integer not greater than x",
32    extended = "Example:\n"
33    + "  > SELECT _FUNC_(-0.1) FROM src LIMIT 1;\n"
34    + "  -1\n"
35    + "  > SELECT _FUNC_(5) FROM src LIMIT 1;\n" + "  5")
36public class UDFFloor extends UDF {
37  private LongWritable result = new LongWritable();
38
39  public UDFFloor() {
40  }
41
42  public LongWritable evaluate(DoubleWritable i) {
43    if (i == null) {
44      return null;
45    } else {
46      result.set((long) Math.floor(i.get()));
47      return result;
48    }
49  }
50
51}